• Silver sony metal cased server power supply unit with ventilation grille for cisco ncs 540 400w dc psu
  • Gray metal cisco n540-pwr400-d 400w dc power supply unit with handle ventilation grilles and warning labels backside view
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Cisco

Cisco N540-PWR400-D | NCS 540 400W DC Power Supply, -48V, Hot-Swap

N540-PWR400-D

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Description

The N540-PWR400-D is a field-replaceable 400W DC power supply module for Cisco NCS 540 series routers, including the medium-density and fronthaul variants. It suits service-provider access, metro aggregation and mobile backhaul or fronthaul sites that run on -48V DC telecom power plants.

This is the DC variant of the NCS 540 400W power supply, accepting a nominal -48V DC input (the NCS 540 platform DC range is -40V to -72V). Power is wired through a two-position terminal-block connector with positive latching, labelled +48V, GRD and -48V. There is no on/off switch on the module. It follows a DC-isolated grounding architecture and supports online insertion and removal, so a unit can be replaced without taking the router out of service. Two power supplies can be fitted for redundancy.

The N540-PWR400-D works with NCS 540 chassis that use the N540-PWR400 power supply alongside the N540-FAN or N540-X-FAN fan trays. It must not be mixed with the AC variant, N540-PWR400-A, so check the ordering section of the datasheet for your specific chassis.

Enquire with XS Network Tech for new or used pricing and availability.

Features

- Hot-swap online insertion and removal
- Supports redundant dual-PSU deployments
- Terminal-block DC input with positive latching
- Suited to telecom -48V DC power plants
- DC-isolated grounding architecture
- Designed for NCS 540 medium-density and fronthaul routers

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

- Part number: N540-PWR400-D
- Description: NCS 540 DC 400W power supply
- Power rating: 400W
- Input type: DC
- Nominal input voltage: -48V DC
- DC input range (NCS 540 platform): -40V to -72V
- Connector: two-position terminal block with positive latching, labelled +48V, GRD, -48V
- On/off switch: none
- Redundancy: dual power supplies supported
- Serviceability: field-replaceable, online insertion and removal
- Grounding architecture: DC-isolated (DC-I)
- AC counterpart: N540-PWR400-A (AC 400W power supply)
- Recommended maximum torque for captive installation screws: 5.5 in-lb (0.62 N-m)

FAQs

Q: Which power input does the N540-PWR400-D need?
A: It needs a DC feed with a nominal -48V input. The NCS 540 platform DC range is -40V to -72V. Power is connected to the terminal block labelled +48V, GRD and -48V.

Q: Can I mix it with the AC power supply?
A: No. The AC variant is the N540-PWR400-A and should not be mixed with this DC unit. Use matching power supplies in a chassis.

Q: Does it have a power switch?
A: No. The module has no on/off switch and is powered through its terminal-block DC input.

Q: Can I run two power supplies for redundancy?
A: Yes. The NCS 540 supports dual power supplies, and the modules can be inserted or removed online.

Q: Which routers use this power supply?
A: It is used in NCS 540 series chassis that take the N540-PWR400 power supply, including medium-density and fronthaul variants with the N540-FAN or N540-X-FAN fan trays. Check your chassis in the datasheet ordering section.

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